Home / 20,931.40-31,401.09-6,895.49

Finding the Fourth Proportional to 20,931.40, 31,401.09 and 6,895.49

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Solution

The fourth proportional to 20,931.40, 31,401.09 and 6,895.49 is: 10,344.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.40 : 31,401.09 = 6,895.49 : x
  2. Step 2: Convert to fraction form
    20,931.40/31,401.09 = 6,895.49/x
  3. Step 3: Cross multiply
    20,931.40x = 31,401.09 × 6,895.49
  4. Step 4: Simplify right side
    20,931.40x = 216,525,745.08
  5. Step 5: Solve for x
    x = 216,525,745.08/20,931.40
  6. Step 6: Final answer
    x = 10,344.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.